Harvester-thresher



March 16, 1943.- A. B. wELrY I HARVESTER-THRESHER Filed Dec. 2:5, 1939 2 Sheets-Sheet 1 90653/ mgl I.

EMO

March 16, 1943.

Filed Dec. 25, i939v A. B. lWELTY HARVESTER-THRESHER llllllIlIII/IIIIII l ma I 2 sheetsLsneet 2 Inventor /befffweigy.

Patented Mar: l16, 1943 2,314,259 HARVESTER-THRESHER Albert B. Welty, Moline, Ill., assignor to International Harvester Company, a corporation of New Jersey Application-December 23, 1939, Serial No. 310,698 s claims. v(ci. 13o- 27) This invention relates to a harvester thresher. More specifically it relates to a variable speed transmission device for driving the cylinder of the thresher.

In the operation of av harvester thresher, the cylinder is required to be driven at different speeds depending upon the crops being threshed. Normally the change in speed is had by the use of a pulley of a diilerent size connected to the drive of the cylinder. It can be easily seen that the detachment of the one pulley and substitution of another is a tedious and time-consuming operation. Under the present invention change in the speed of the cylinder is accomplished With--v out the substitution of one pulley for another.

An object'of the present invention is the provision of an improved harvester thresher.

Another object is the provision of al harvester thresher in which the cylinder of the thresher may be driven at different speeds.

A further object is the provision of an imp roved speed transmission device. l

Still another'object is to provide a novel supporting means for a pulley constituting a variable speed transmission device.

According to the present invention, a source of power for driving the partsvof the novel harvester thresher voriginates with a drive shaft mounted on the draw frame of the harvester thresher and driven by a tractor. Drive from the drive shaft to the threshing 4cylinder is transmitted through three pulleys and a pair of belts, one of the pulleys being composed of adjustable y sections in engagement with the two belts- IThe latter pulleyis supported on members which permit easy bodily shifting of the pulley, by which shifting the variation in the speed of the cylinder is effected. In the drawings: l

Figure 1 is a side view of the harvester thresher of the present invention;

Figure 2 is a side view showing in detail the adjustable pulley andthe members supporting the line 4-4 I8, includes a shell I6 and various elementsfsuch as a beater, a fan, and a shaker, which are not shown since they form no part of the present invention. However, means by which these various parts are driven is shown. AA pulley I1 for the beater i s positioned on the outside of the shell. Likewise, a pulley I9`for the fan, idler pulley 28, shaker shaft pulley 2|, and pulley 22 vdriven by the shaker shaft pulley 2 I" and serving as a crank for a connecting rod 23 connected in turn to a bell' crank 24 serving to shake the shaker.` l

A grain elevator 25 is secured to the outside of the shell I6 and is driven by a belt 28 in engagement with-the pulley 22. The belt 26 also drives the grain auger 21. The pulleys l1, 20, and 2l are driven by a belt 28, in turn driven by a pulley, not shown, secured to a shaft 29 of a -belt 34, pulley 35, belt 38, .sprocket 3l., and a sprocket chain 38 adapted to be connected forl drive by a wheel 39. The wheel 39 is one of a pair of Wheels, which is supported by an axle 48, to which' the draw frame I2 is secured, and upon which the harvester part Il is mounted.

'I'he thresher -part Il has a cylinder, of which the ruby bars 4I are shown in dotted lines. The cylinder is mounted upon a shaft 42, lupon the end of which is secured a pulley 43. A belt 44 is in engagement with the pulley 43 and with a pulley 45. A belt 46 engages the pulley 45 and a pulley 41 secured to the shaft 29 in the gear box 30. The pulley 45 is shown in detail in Figure 3 and comprises amiddle section 48 and similar outer sections 49 and 5l). The middle section 48 has an outer flange portion 5I of V-section,

permit an axialmovement of the outer sections 49 and 58 with respect to the middle section 48 andV prevent-rotational movement of the outer sections 49 and 55 with respect tothe middle sec-- tion 48. Cup-shapedv members 58 and 59 retain the pulley 45 upon'the shaft 54, which is secured, as by soldering or welding, at one end of a rectangular tubular section 60. A bracket S l. embraces the other end of the member 60 and has elongated slots 62 formed therein. The bracket l is secured to theaxle 40 by means of a bolt t3 and nuts 54. A U-shaped member 65 -embraces the bracket 5I and is secured to the end of the member l by a nut 61 and a bolt or pin 56 passing through the members 60 and 85 and the slots 52 in the brackets 6I. A nut 68.is secured to the base of the U-shaped member 65. An adjusting screw. has a crank portion 10, a threaded portion 1i, a shoulder 12, and an end portion 13. The threaded portion 1| is in threaded engagement with the nut 5.8. 'I'he end 13 extends through an opening in a part 14 abutting or secured to the bracket il, the shoulder 12 abutting the part 14. A U-shaped member 15. is pivotally connected to the draw frame I2 by means or a bolt 1l. The U-shaped member 15 has hanged legs l1 which embrace a. mid-portion of the member 5l. The legs 11 have slots 18 therein. A U-shaped member 19 embraces the member 15 and has a nut 8l secured in the base Il thereof. An adjusting screw 82 has a threaded poron 33, an enlarged portion 84 at one end permitting hand adjustment of the screw, and

shoulder portions l5 and 3B at the other end 81. l

The threaded portion 83 is in threaded engagement with 'the nut Il. The shoulders 85 and 86 provide a rotatable connection of the end 81 of the adjusting screw with the base of the U-shaped member 15. A pin or bolt Il passes through the members 5l and 13 and the slots 18 in the members 15. A nut I! is secured to the end of the bolt".

, Operation of the harvester thresher is in the usual manner. 'Ihetracton notV shown, operatproportimal to the speed of the drive shaft 3| because of the driving connection of the various pulleys with the drive shaft 3| through the belts The cylinder of the thresher part,

23 and li. however, may be driven at a speed which varies for any one speed of the drive shaft 3| because of the pulley I5. When the pulley I5 is in the full line podtion of Figure 2. the spacing of the pulley is such that the belt 45 contacts the pulley at the largest diameter possible, and the belt 44 coutacts the pulley at a much smaller diameter. The reasonfor this may be seen from Figure 3. As seen in this ligure, the pulley sections 48 and 5l are as close to one'another as possible, and cmseqntly the belt 45 is at the largest possible diameter. The sections 48 and I9, however, are

separated as far as pomble, and, consequently, the belt Il is at the minimum diameter. In the dotted line position of Figure 2, the diameters at which the belts Il and I6 contact the pulley 4,5 are reversed.' In this position, the sections I8 and l! ofthepulleyareasclosetoone anotheras possible. and thesections Il and 50 are separated as much as possible. Shifting of the pulley I5 from the full'line position to the dotted position is eifected through the adjusting screw'82. The screw-is turned so as to bring the base of the U-shaped member 15 asl close tothe base of the U-ahaped member 15 as possible. 'I'his 4causes a pin 31 to be moved to the opposite end of the slots 1I from that shown in Figure 4. Thus thememberilismovedtowardthebase endo! 'l5 the member 15, and the pulley I5 is swung to the dotted line position. Asis evident by comparison of the full line and the dotted line positions of the member 60, the end of the member 60, to 5 which the member 65 is attached, has been moved to the right so that the proper tension is maintained on the belts. This is eiected by an adjustment of the screw 1| so that the space between the base of the member 65 and the part 1I with the bracket -6I is increased to a maximum from the spacing shown in Figure 3. 'I'hat causes the bracket $5 to move to the right and with it the end of the member 60, because of the connection of the members 60 and i5 by the Pin S6.

It will be seen from the foregoing description that a novel-harvester thresher has been provided by which various parts of a thresher are driven at a constant speed with relation to the 2 drive shaft, and the cylinder is driven at a variable speed so that the thresher adapts itself easily to crops of various kinds. The driving connection between the drive shaft and the threshing cylinder' includes a pulley of shiftable sections which permit change in the speed ratio between the threshing cylinder and the drive shaft. The pulley is mounted upon members which permit the necessary bodily adjustment of the pulley for the required change in speed.

'I'he intention is to limit the invention only within the terms of the appended claims.

What is claimed is:

1. A thresher construction comprising a thresher part including thresher mechanism, an

axle therefor, a source of power, a variable speed driving connection between the source of power and the thresher mechanism comprising a pulley formed of three sections of which the two outer sections are fixed against relative movement and are movable with respect to the middle section, and means for varying the position of the pulley, comprising a tlrst member supporting the pulley at one end, a bracket secured to the axle and comprising a pair of spaced portions each having an elongated slot and embracing the other end of the first member, a second U-shaped member embracing the spaced portions of the bracket, a pin connecting the U-shaped member and the said other end of the rst member and passing through the slots in the bracket, an adjusting screw threaded through the base of the U-shaped member and contacting the bracket, a third member pivotedat one end on the drawframe and having spaced portions embracing a midportion of the first member and each having an elongated slot, a fourth U-shaped member embracing the third member, a pin connecting the flrst and fourth members and passing through the slots in the third member, and an adjusting screw threaded through .the base of the fourth U-shaped vmember and connected .to the third member.

2. A thresher construction comprising an axle and a thresher part including thresher mechanism, a source of power, a variable speed driving connection between the source of power and the thresher mechanism comprising a pulle'y formed of three sections of which the two outer sections' are fixed against relative movement and are movable with respect to the middle section, and means for shifting the pulley, comprising a rst member supporting the pulley at .one end, a second member pivotally connected to the other end of the iirst member by means of a pin, a third member secured tothe axle and having an elonthe pin, means acting between the secondand third members to shift the position of the pin inthe slot and thereby to shift A'the rst member, a fourth member pivoted on the irame and having an elongated slot, a

gated slot receiving pin extending through' the slotA and the rst member, vand meansfor shifting the position ofl the 'pin in the slot so as to adjust the first member.

3. A thresher construction,v comprising, a thresher partl including a,v cylinder and other tlzujesher mechanism, an axle supporting the draw frame, a drive shaft mounted on the draw frame, and a variable speed transmission device 

